Head restraints and factory air bags: how to set them, check them and keep them working

Set your head restraint to cut whiplash risk and keep your air bag system ready

Safety Behind the Wheel Foundationdrivewithcare.org

Last reviewed:

For every driver16 min read

Seat belts and occupant protectionAirbagsWhiplashVehicle safety systemsVehicle safety and maintenance

Safety Behind the Wheel Foundation built this guide from federal head restraint and air bag standards, Insurance Institute for Highway Safety (IIHS) research, National Highway Traffic Safety Administration (NHTSA) guidance and published whiplash studies. Every source is listed at the end. It focuses on head restraints and everyday air bag care. Our air bag safety guide covers seating distance, children and the front seat, warning lights, deployments and recalled or fake air bags in more depth.

Seats, belts, head restraints and air bags work as a team

Your seat belt does most of the work in a collision. Head restraints and air bags fill in around it, and they work as one system. The seat, belt, head restraint, air bags and the sensors that control them are tuned together for each vehicle.

You choose this equipment when you choose a car, then protect it for as long as you own it. This guide is for parents, caregivers, owners and anyone who drives other people.

The payoff is large. By NHTSA’s estimate, frontal air bags saved 4,330 lives in 2019 [1]. Counting every year through 2019, the total reached 70,059 [1]. In frontal crashes, front air bags lower driver deaths by 29% and deaths of front passengers 13 and up by 32% [1]. Side air bags with head protection cut the death risk for car drivers hit on their side by 37% [1].

Each part helps in certain impacts, and air bags work best when people wear belts and sit properly [1]. Head restraints matter most when you are hit from behind.

How a head restraint prevents whiplash

Federal rules define a head restraint as a device that limits how far your head can move backward compared with your torso [2]. The standard’s goal is to make neck injuries in rear end and other crashes less common and less severe [2].

Here is what happens when a restraint is set too low. Your car is hit from behind, and the seat shoves your body forward. Your head lags for a split second, so the neck bends back and stretches. That sudden motion can strain the soft tissues of the neck. People call this whiplash.

Whiplash does not take a hard collision. Researchers note that these injuries happen at fairly small jolts, typically a change in speed of less than about 15 mph (25 km/h) [3]. Rear impacts are the most common cause [3]. The same research reports that women face 1.5 to 3 times the whiplash risk of men [3]. An earlier claims study also found lower neck injury rates for male drivers and for drivers in less severe collisions [4].

The idea is simple. Put a firm surface close behind the head, so it moves with the body instead of snapping back.

What the research shows about head restraints

Much of the evidence comes from insurance claims, which capture many low speed rear end collisions.

Comparison compiled by Safety Behind the Wheel Foundation

What head restraint research found

What was studiedWhat researchers found
Head restraint position in cars hit from behindLower neck injury rates when restraints were more likely to sit behind drivers’ heads [4]
Redesigned head restraints with better fitWhiplash risk dropped a lot for female drivers but changed little for male drivers [5]
Active head restraints that move up and closer in a rear impactAbout 43% fewer whiplash injury claims, and 55% fewer for female drivers [5]
Seats rated good vs. poor in rear impact tests15% fewer driver neck injuries, and 35% fewer that lasted 3 months or more [6]

Seat design matters as much as the head restraint. The Insurance Institute for Highway Safety (IIHS) once rated seats in a sled test. The test mimicked a parked car hit from behind by a same weight vehicle going 20 mph [7]. IIHS retired the test once nearly every model was scoring well [7].

When you shop for a vehicle

Since most new seats now test well, focus on fit and history:

  • Sit in every seat your family will use. Check that each head restraint rises high enough for your tallest rider.
  • Confirm side air bags are there. Most passenger vehicles now come with them as standard equipment [1].
  • Run the VIN through NHTSA’s recall lookup before you buy [8].
  • For a used car, get a vehicle history report and look for past air bag deployments or crashes [9].

Set your head restraint in 30 seconds

Researchers have reported that drivers often set adjustable head restraints incorrectly [3]. Posture matters too. A study of 154 people in a modern car measured the gap behind each person’s head [10]. It averaged 61 millimeters (about 2.4 inches) for drivers and 103 millimeters (about 4 inches) for rear passengers [10]. Slouching made it bigger in every seat [10].

That gap is called backset. The federal standard caps it at 55 millimeters, a bit over 2 inches, in a set test position [2]. Use that as a rough guide, then follow this routine whenever a new person takes a seat:

  1. Set the seat first. Adjust height, distance and seatback for safe driving. Then sit upright with your back against the seat.
  2. Find the release. It is usually a button at the base of one post. Your owner’s manual shows how yours moves.
  3. Raise it. Aim for the top of the restraint to be about level with the top of your head. If it cannot go that high, use the highest setting.
  4. Close the gap. If the restraint tilts, bring it toward the back of your head. If not, a slightly more upright seatback can help.
  5. Lock it. Press down firmly. It should click into place and not slide.
  6. Check every seat. Repeat for each passenger, including the back seat.

Back seats, car seats and shared vehicles

Rear head restraints are easy to forget. Some fold down when a seat is empty. Federal rules allow a folded position only if the design makes it hard to miss. It might spring back up on its own, fold at a steep angle, or tip a rider’s back noticeably upright [2]. The habit that matters is simple: raise it before anyone sits there.

Car seats add a wrinkle. A head restraint can keep a forward facing car seat or booster from sitting flat against the vehicle seat. NHTSA advises following the car seat maker’s instructions and reading the vehicle owner’s manual for installation [11]. Safety Behind the Wheel Foundation gives families the same advice. Those manuals tell you whether a head restraint may be adjusted or removed. If you take one out, keep it in the car. Put it back as soon as an adult or older child uses that seat.

If you drive a shuttle, group van or carpool, add a quick look to your pre trip check. Make sure no head restraints are missing, remind riders to raise theirs and confirm the air bag light goes out after you start the engine.

Inside your factory air bag system

The air bags are only the part you can see. Behind the trim are crash sensors, a control module and wiring.

Newer systems check belt use. They pair a belt sensor with built in logic to choose whether a bag should fire in a particular crash [1]. When weight sensors pick up a child seat or a small driver or passenger, advanced air bags adjust how they deploy [1].

Many advanced frontal systems shut off the passenger air bag on their own. They do this when they sense a child or small adult, a child in a car seat, or an empty seat [12]. Some side air bag systems also switch off when a child in the front passenger seat is sitting too near the bag [12]. Many depend on the pressure on the seat cushion, called “loading” [12].

All of this has to stay healthy to work. Federal rules require every air bag system to watch its own readiness and show a warning light the driver can clearly see [13]. If a vehicle switches the passenger air bag off by itself, the owner’s manual must explain where the status light is and when it turns on [13].

When the warning lights look wrong

Warning lights are the system’s only way to talk to you. Learn what normal looks like in your owner’s manual.

NHTSA explains that anything that changes the weight the seat senses can lead the system to misjudge who is there [12]. Start with easy fixes: clear items off the seat and have the rider sit upright and centered. If the light still does not match, the agency points owners to the owner’s manual [12]. If that fails, have the system checked.

Never “fix” a warning light by pulling a fuse, unplugging parts or clearing codes with a scan tool. NHTSA cautions owners not to inspect air bag parts themselves, because handling them can set off the bag and cause death or serious injury [9]. A light that goes dark without a real repair hides the problem. It does not solve it.

Keep the system current with recall checks

A recall happens when a manufacturer or NHTSA decides a vehicle or part poses an unreasonable risk to safety or does not meet a minimum safety standard [8]. An air bag inflator recall that started in 2015 is the biggest in U.S. history [1]. Some recalled vehicles carry “Do Not Drive” warnings because their risk of an air bag explosion is far higher [14]. Our air bag safety guide covers that recall in more detail.

Build recall checks into owning the car:

  1. Find your 17 character VIN. It is on the lower left of the windshield, your registration card and often your insurance card [8].
  2. Enter it in NHTSA’s recall lookup tool at nhtsa.gov/recalls [8].
  3. Read any notice with care, and take a “Do Not Drive” warning at its word [14].
  4. Call a dealer for your brand to schedule the repair, which is free [8, 14].
  5. Repeat at least twice a year, as NHTSA recommends, and before buying any used car [14].

NHTSA’s free SaferCar app can alert your phone when it finds a recall for a vehicle or car seat you entered [8]. The online search does not show recalls more than 15 years old unless the automaker offers longer coverage [8]. For an older car, ask a dealer too.

Why add on and bargain air bag parts are a bad trade

Factory air bags are designed, placed and timed for one vehicle. A product that claims to add air bag protection later was not built with your car’s sensors, seats and trim. Skip aftermarket add on air bag products entirely.

Covers are a common trap. IIHS advises against aftermarket dash and seat covers, which can get in the way of an opening air bag or push it off course [1]. In many vehicles, a side air bag is built into the front seat [1]. Keep phone mounts, stickers and decorations off the steering wheel center and any panel marked for an air bag.

Replacement parts are the bigger danger. NHTSA has warned about cheap, substandard replacement inflators, the part that fills the bag with gas [15]. Many were made overseas, ordered online and priced far under what genuine parts cost [15]. Inflators marked “DTN60DB” have burst and sent metal pieces into drivers [9].

Get replacement air bag parts through the vehicle maker’s dealer parts department. Have them installed by a dealer or a reputable repair shop that follows the automaker’s procedures [15]. When you have work done, ask which parts were used and keep the paperwork [15].

A care routine for owners and families

Most of this takes seconds once it becomes a habit.

After a rear end collision, the seat and head restraint may have taken a heavy load even if they look fine. Ask the shop to inspect them using the automaker’s repair procedures.

Frequently asked questions

Is a head restraint just a headrest for comfort?

No. It is safety equipment covered by a federal standard. Its job is to limit how far your head moves backward compared with your body in a crash [2]. Position matters more than padding. A restraint set low, or far behind your head, gives your neck room to bend back before it helps. Reset it whenever a different person uses the seat.

Can I take out a head restraint to see better or to fit a car seat?

Not for a seat someone is using. Front head restraints should stay in place and be raised for whoever sits there. Some rear restraints fold when the seat is empty, but raise them before a rider sits down. For car seats, follow both the car seat instructions and the vehicle owner’s manual [11]. If they allow removal, keep the restraint in the car and reinstall it when an adult or older child uses that seat.

My air bag light came on after I moved things under the seat. What should I do?

Treat it as a real fault until a technician says otherwise. The light is the system’s self check, and it exists to tell you the system may not be ready [13]. Do not unplug connectors or clear codes yourself. Book a diagnosis with a dealer or qualified repair shop. Tell them what you were doing when the light came on, since that detail can speed up the repair.

The bottom line

Recommendation from Safety Behind the Wheel Foundation

Safety Behind the Wheel Foundation urges every driver to set the head restraint for each new rider and to get any air bag warning light checked soon. Head restraints and air bags are protection you already own. The head restraint needs your help each time a new person sits down: raise it, close the gap and lock it. The air bag system mostly runs itself. It counts on you to notice its warning lights, keep recall repairs current and keep cheap parts and covers out of its way.

If you are getting back on the road after a car accident, these small steps can help you feel more in control. A quick setup before each trip keeps your car’s built in protection ready.

Sources and further reading

  1. 1Insurance Institute for Highway Safety and Highway Loss Data Institute. Airbags. Updated July 2026. Data year: NHTSA lives-saved estimates for 2019 and cumulative through 2019; effectiveness studies published 2007-2015. iihs.org/research-areas/airbags
  2. 2Electronic Code of Federal Regulations (National Archives). 49 CFR 571.202a, Standard No. 202a; Head restraints. Current as of October 2026. ecfr.gov/…/section-571.202a
  3. 3Carlsson A, Pipkorn L, Kullgren A, Svensson M. Real-world adjustments of driver seat and head restraint in Saab 9-3 vehicles. Traffic Injury Prevention 18(4):398-405, via PubMed. Published online 2016. Data year: volunteer measurements reported in the study; background on whiplash risk from earlier research. doi:10.1080/15389588.2016.1217522. pubmed.ncbi.nlm.nih.gov/27617749
  4. 4Farmer CM, Wells JK, Werner JV. Relationship of head restraint positioning to driver neck injury in rear-end crashes. Accident Analysis and Prevention 31(6):719-28, via PubMed. Published November 1999. Data year: insurance claims analyzed in the study (published 1999). doi:10.1016/s0001-4575(99)00035-4. pubmed.ncbi.nlm.nih.gov/10487347
  5. 5Farmer CM, Wells JK, Lund AK. Effects of head restraint and seat redesign on neck injury risk in rear-end crashes. Traffic Injury Prevention 4(2):83-90, via PubMed. Published June 2003. Data year: insurance claims analyzed in the study (published 2003). doi:10.1080/15389580309867. pubmed.ncbi.nlm.nih.gov/16210192
  6. 6Farmer CM, Zuby DS, Wells JK, Hellinga LA. Relationship of dynamic seat ratings to real-world neck injury rates. Traffic Injury Prevention 9(6):561-7, via PubMed. Published December 2008. Data year: insurance claims analyzed in the study (published 2008). doi:10.1080/15389580802393041. pubmed.ncbi.nlm.nih.gov/19058103
  7. 7Insurance Institute for Highway Safety. Head restraints (discontinued test, About our tests). No date shown; accessed October 2026. iihs.org/ratings/about-our-tests/head-restraints
  8. 8National Highway Traffic Safety Administration. Check for Recalls: Vehicle, Car Seat, Tire, Equipment. No date shown; accessed October 2026. nhtsa.gov/recalls
  9. 9National Highway Traffic Safety Administration. What to Know: Deadly Air Bag Replacements. Updated September 3, 2026. nhtsa.gov/air-bags/deadly-air-bag-replacements
  10. 10Jonsson B, Stenlund H, Svensson MY, Bjornstig U. Backset and cervical retraction capacity among occupants in a modern car. Traffic Injury Prevention 8(1):87-93, via PubMed. Published March 2007. Data year: measurements of 154 test subjects reported in the study (published 2007). doi:10.1080/15389580600911010. pubmed.ncbi.nlm.nih.gov/17366340
  11. 11National Highway Traffic Safety Administration. Car Seats and Booster Seats. No date shown; accessed October 2026. nhtsa.gov/…/car-seats-and-booster-seats
  12. 12National Highway Traffic Safety Administration. Vehicle Air Bags and Injury Prevention. No date shown; accessed October 2026. nhtsa.gov/vehicle-safety/air-bags
  13. 13Electronic Code of Federal Regulations (National Archives). 49 CFR 571.208, Standard No. 208; Occupant crash protection (S4.5.1 and S4.5.2). Current as of October 2026. ecfr.gov/…/section-571.208
  14. 14National Highway Traffic Safety Administration. Takata Air Bag Recall Spotlight. No date shown; accessed October 2026. nhtsa.gov/vehicle-safety/takata-recall-spotlight
  15. 15National Highway Traffic Safety Administration. Consumer Alert: NHTSA Alerts Used Car Owners, Buyers of Dangerous, Substandard Replacement Air Bag Inflators. Published July 10, 2024. nhtsa.gov/…/consumer-alert-nhtsa-alerts-used-car-o…

This article reflects the safety priorities of occupant protection, whiplash prevention and everyday air bag care. It is general education, not legal, medical, insurance or repair advice. Rules and recalls change, so verify details with official sources. For your own vehicle, read the owner's manual and talk with the vehicle maker's dealer or a qualified repair shop. If you have neck pain or other symptoms after a crash, see a health care provider. Reviewed October 2026.

Cite this article: Safety Behind the Wheel Foundation. “Head restraints and factory air bags: how to set them, check them and keep them working.” drivewithcare.org, https://drivewithcare.org/head-restraints-air-bag-system-care/. Reviewed October 2026.

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